fix: trade-pro review fixes — drop shadow blocks.css, English presets, 7-item fallback nav

- remove themes/trade-pro/blocks.css (52-byte placeholder shadowed the
  platform 7KB block stylesheet via copy_blocks_css) and drop it from
  manifest styles; Phase 3 brings real component styles
- page-presets.json: all editor/bootstrap copy translated to trade B2B
  English; ids, block types, structure and hrefs identical to industrial
- fallback nav widened to all 7 default sections (Brands/Cases restored)
  so the documented false-positive window only relabels, never drops
  coverage; comment added next to the tp_needs_en_nav set
- test anchors '>Products<' on the built home page

Co-Authored-By: Claude Code <noreply@anthropic.com>

themes/trade-pro/manifest.json

@@ -5,7 +5,7 @@
   "version": "1.0.0",
   "style": "international-b2b",
   "entry": "pro.html",
-  "styles": ["theme.css", "blocks.css"],
+  "styles": ["theme.css"],
   "page_templates": ["home","about","contact","listing","category","product","article","brand","case","service","faq","standard","notfound"],
   "blocks": ["hero","richtext","features","stats","collection","image_text","gallery","faq","cta","attributes","spacer","layout","carousel","video","tabs","pricing","map","form_link"],
   "responsive": true,